Deepshikha Mukherjee is a post-mortem doctor at Bengal Medical College. Calcutta police officer Varun Sarkar came to him in the interest of three separate investigations. In the novel 'Karkatkranti', people of different professions, different ages and different social status are dying abnormally in different parts of Kolkata. Post-mortem shows swollen lymph nodes in all. In the novel 'Investigation', there is an unusual death of a member of the Banedi doctor family of Bhavanipur, who is also a psychiatrist. It is known in the past while doing post mortem